Change Post Publish Date to Post Modified Date in All Places

I wonder if this would work for you:

is_admin() || add_filter( 'get_the_date', function( $the_time, $d, $post  ) 
{
     return get_the_modified_date( $d, $post );
}, 10, 3 );

where we override the output of get_the_date() with get_the_modified_date(), for the front-end.

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